What's the big circle on my wall?

one hour continuous pendulus : https://youtu.be/hXOEoH5q3Hw

https://www.devinmontes.com/pendulus

pendulus is one of my favorite projects, a stunning visualization of the beauty in chaos.

The paint used was Rustoleum Glow-in-the-Dark : http://amzn.to/2qagwhO